（News Release） The Results of Radioactive Material Monitoring of the Surface Water Bodies within Miyagi Prefecture (April-June Samples)
Friday, August 10, 2012 Water Environment Division, Environment Management Bureau, Ministry of the Environment Direct line: 03-5521-8316 Switchboard: 03-3581-3351 Director: Tadashi Kitamura (ext. 6610) Deputy Director: Tetsuo Furuta (ext. 6614) Coordinator: Katsuhiko Sato (ext. 6628)
In accordance with the Comprehensive Radiation Monitoring Plan determined by the Monitoring Coordination Meeting, the Ministry of the Environment (MOE) is continuing to monitor radioactive materials in water environments (surface water bodies (rivers, lakes, headwaters, and coasts), etc.). Samples taken from the surface water bodies of Miyagi Prefecture during the period of April 28-June 29, 2012 have been measured as part of MOE’s efforts to monitor radioactive materials; the results have recently been compiled and are released here. * The monitoring results of radioactive materials in surface water bodies carried out to date can be found at the following web page: http://www.env.go.jp/jishin/rmp.html#monitoring
1. Survey Overview (1) Survey Locations 59 environmental reference points, etc. in the surface water bodies within Miyagi Prefecture (Rivers: 43 locations, Lakes: 16 locations)
(2) Survey Method ・ Measurement of concentrations of radioactive materials (radioactive cesium (Cs-134 and Cs-137), etc.) in water and sediment ・ Measurement of concentrations of radioactive materials and spatial dose-rate in soil in the surrounding environment of water and sediment sample collection points (river terraces, etc.)
2. Outline of Results (* denotes the results of the previous study (January-February)) (1) Water Quality (Lower detection limit: 1Bq/L) (Rivers) Cs-134: Not detectable (ND)-3Bq/L Cs-137: ND-4Bq/L (*ND at any location) (Lakes and headwaters) Cs-134, Cs-137: ND at any location (*ND at any location)
Target value for radioactive materials in tap water (management target for water supply facilities) (March 5, 2012; 0305 Notice No.1 from the Director of the Water Supply Division, Health Service Bureau, Ministry of Health, Labour and Welfare) Radioactive cesium (total for Cs-134+Cs-137): 10Bq/kg
(2) Sediment (Lower detection limit: 10Bq/kg (dried mud)) (Rivers) Cs-134: ND-1,400Bq/kg (dried mud) Cs-137: ND-2,000Bq/kg (dried mud) (*Cs-134: 12-1,100Bq/kg (dried mud)) (*Cs-137: 24-1,600Bq/kg (dried mud))
(Lakes and headwaters) Cs-134: ND-1,200Bq/kg (dried mud) Cs-137: 12-1,800Bq/kg (dried mud) (*Cs-134: 130-1,200Bq/kg (dried mud)) (*Cs-137: 220-1,800Bq/kg (dried mud))
(3) Surrounding Environment (Lower detection limit: 10Bq/kg (dry)) (Rivers) Cs-134: 15-2,300Bq/kg (dry) Cs-137: 27-3,400Bq/kg (dry) (*Cs-134: 45-1,600Bq/kg (dry)) (*Cs-137: 61-2,200Bq/kg (dry)) Spatial dose: 0.05-0.42μSv/h
(Lakes and headwaters) Cs-134: 53-1,700Bq/kg (dry) Cs-137: 94-2,700Bq/kg (dry) (*Cs-134: 100-1,600Bq/kg (dry)) (*Cs-137: 130-2,300Bq/kg (dry)) Spatial dose: 0.03-0.27μSv/h
(Annex for details) (Map attached)
Future Plans In coordination with relevant organizations, MOE intends to continue to measure radioactive materials in water, sediment, etc. in rivers, lakes, etc. in Fukushima Prefecture, its neighboring prefectures, etc.
○River: Water Quality Monitoring Results (Annex) Sampling point General items Concentration of radioactive material Bq/L Full depth Sampling date Weather Sampling depth Transparency Electrical conductivity SS Turbidity Radioactive iodine Radioactive cesium Remarks No. Water body Point Municipality m m cm mS/m mg/L I-131 Cs-134 Cs-137
1 Kinzanbashi Bridge 2012/6/19 Cloudy 0.2 0.0 >100 13 1 1 <1 <1 <1 Shishiorigawa River 2 Namiitabashi Bridge 2012/6/19 Cloudy 0.2 0.0 72 1,856 <1 1 <1 <1 <1
3 Tateyamaohashi Bridge 2012/6/19 Rain 0.5 0.0 >100 14 1 1 <1 <1 <1 Kesennumashi City 4 Okawa River Kamiyamabashi Bridge 2012/6/19 Rain 0.3 0.0 >100 178 <1 1 <1 <1 <1
5 Okawa River Estuary 2012/6/19 Rain 0.3 0.0 >100 3,920 3 2 <1 <1 <1
6 Omosegawa River Ozakibashi Bridge 2012/6/19 Rain 0.9 0.0 >100 243 2 3 <1 <1 <1
7 Arimagawa River Unandabashi Bridge 2012/6/19 Rain 0.3 0.0 >100 20 2 2 <1 <1 <1
8 K Kinryugawa River Obatabashi Bridge 2012/6/20 Cloudy 0.5 0.0 13 7 50 13 <1 <1 <1 i 9 Kitakamigawa River Tomeohashi Bridge (Tome) 2012/6/19 Rain 2.1 0.0 87 13 4 2 <1 <1 <1 t 10 a Sanhasamagawa River Domanbashi Bridge (Kurikoma Dam) Kuriharashi City 2012/6/20 Sunny 1.0 0.0 7 6 87 33 <1 <1 <1 k 11 Nihasamagawa River Kajiyabashi Bridge 2012/6/20 Cloudy 0.9 0.0 21 8 19 7 <1 <1 <1 a Hasamagawa 12 S m Hanayama Dam, inflow area 2012/6/19 Rain 0.8 0.0 >100 9 1 1 <1 <1 <1 River y i Hasamagawa River 13 s g Wakayanagi 2012/6/19 Rain 0.9 0.0 68 12 8 3 <1 <1 <1 14 t a Yamayoshidabashi Bridge Tomeshi City 2012/6/21 Sunny 2.0 0.0 17 12 32 12 <1 <1 <1 e w 15 m a Todorokibashi Bridge (Todoroki) 2012/6/20 Cloudy 0.6 0.0 9 6 90 29 <1 <1 <1 Eaigawa River
16 Shimizukomon Weir Osakishi City 2012/6/20 Cloudy 0.2 0.0 9 9 48 27 <1 <1 <1 R Eaigawa 17 i In Furukawa District, Osakishi City Shinborisaihon, entrance 2012/6/21 Cloudy 4.5 0.0 50 23 16 8 <1 <1 <1 River v 18 e Dekigawa River Kogotabashi Bridge Misatomachi Town 2012/6/20 Sunny 0.2 0.0 16 13 53 13 <1 <1 <1 19 r Eaigawa River Oikawabashi Bridge (Tandai) Wakuyacho Town/Ishinomakishi City 2012/6/21 Sunny 0.6 0.0 28 12 29 6 <1 <1 <1
20 Kyukitakamigawa River Kadonowaki Ishinomakishi City 2012/6/21 Sunny 0.2 0.0 15 13 72 19 <1 <1 <1
21 Narusegawa River Onobashi Bridge (Ono) Higashimatsushimashi City 2012/6/21 Cloudy 0.3 0.0 21 16 30 9 <1 <1 <1
22 Tagajozeki Weir 2012/6/21 Sunny 0.2 0.0 20 25 24 9 <1 <1 <1 Sunaoshigawa River Tagajoshi City 23 Nenbutsubashi Bridge 2012/6/21 Cloudy 0.7 0.0 19 561 18 5 <1 <1 <1
24 Teizan-unga Canal (Kyusunaoshigawa River) Teizanbashi Bridge Shiogamashi City/Shichigahamamachi Town/Tagajoshi City 2012/6/21 Cloudy 0.6 0.0 31 1,746 5 3 <1 <1 <1
25 Nanakitabashi Bridge 2012/6/7 Sunny 0.3 0.0 58 18 3 2 <1 <1 <1 Nanakitagawa River 26 Nanakitagawa Fukudaohashi Bridge 2012/6/7 Sunny 0.2 0.0 54 202 1 2 <1 <1 <1 River Sendaishi City 27 System Umedagawa River Fukudabashi Bridge 2012/6/7 Cloudy 0.8 0.0 42 20 5 3 <1 <1 <1 28 Nanakitagawa River Takasagobashi Bridge 2012/6/7 Cloudy 0.3 0.0 51 1 6 3 <1 <1 <1
29 Natorigawa River Yuriageohashi Bridge Sendaishi City/Natorishi City 2012/6/6 Sunny 0.2 0.0 31 2 14 3 <1 <1 <1
30 Natorigawa Yakushibashi Bridge 2012/6/6 Cloudy 0.6 0.0 >100 10 <1 1 <1 <1 <1 River 31 System Masudagawa River Koyamabashi Bridge Natorishi City 2012/6/6 Cloudy, partly rain 0.4 0.0 69 15 3 2 <1 <1 <1
32 Bishamonbashi Bridge 2012/6/6 Cloudy 0.3 0.0 39 54 12 4 <1 <1 <1
2012/4/29 Sunny 0.3 0.0 45 10 3 1 <1 <1 <1
33 Hadeniwabashi Bridge Marumorimachi Town 2012/5/7 Sunny 0.8 0.0 10 11 42 21 <1 <1 <1
A 2012/6/4 Cloudy, partly sunny 1.0 0.0 61 18 <1 1 <1 <1 <1 b 2012/4/28 Sunny 0.7 0.0 59 10 5 2 <1 <1 <1 u Abukumagawa River 34 k Marumoribashi Bridge Marumorimachi Town 2012/5/7 Sunny 0.6 0.0 9 10 25 14 <1 <1 1 u 2012/6/5 Sunny 0.3 0.0 68 18 <1 1 <1 <1 <1 m a 2012/5/4 Rain 1.0 0.0 3 7 520 210 <1 3 4 35 g Ejiribashi Bridge Kakudashi City a 2012/5/28 Sunny 0.3 0.0 23 15 6 3 <1 <1 <1 36 w Shiroishigawa River Before the confluence with Kawaragosawa River (Sunaoshibashi Bridge) Shiroishishi City 2012/6/5 Sunny 1.0 0.0 60 7 <1 1 <1 <1 <1 a 37 Saikawa River Etsubobashi Bridge Shiroishishi City 2012/6/5 Sunny 1.8 0.0 47 12 5 3 <1 <1 <1 R Shiroishigawa 38 Matsukawa River Miyaohashi Bridge Zaomachi Town 2012/6/5 Cloudy 0.6 0.0 >100 18 <1 1 <1 <1 <1 i River 39 v Arakawa River Niragamibashi Bridge Muratamachi Town/Ogawaramachi Town 2012/6/5 Sunny 0.3 0.0 54 18 5 2 <1 <1 <1 e 40 Shiroishigawa River Shirahatabashi Bridge Shibatamachi Town 2012/6/5 Cloudy 0.7 0.0 80 14 1 1 <1 <1 <1 r 2012/5/4 Cloudy 0.3 0.0 5 7 160 77 <1 <1 <1 41 S Tsukinokiohashi Bridge Kakudashi City/Shibatamachi Town y 2012/5/28 Sunny 0.2 0.0 35 16 5 3 <1 <1 <1 s 2012/4/28 Sunny 1.2 0.0 41 9 13 4 <1 <1 <1 t 42 e Abukumagawa River Abukumaohashi Bridge (Iwanuma) Iwanumashi City/Wataricho Town 2012/5/7 Sunny 0.8 0.0 10 9 25 15 <1 <1 <1 m 2012/6/6 Cloudy 1.0 0.0 51 18 1 1 <1 <1 <1
Abukumagawa River Estuary 2012/5/4 Cloudy 0.3 0.0 5 7 160 77 <1 <1 <1 43 Iwanumashi City/Wataricho Town (Watariohashi Bridge) 2012/5/28 Rain 0.7 0.0 61 238 1 1 <1 <1 <1
・Sampling points for rivers are listed from north to south, and for different points along the river, from upstream to downstream. ○River: Sediment Monitoring Results Sampling point General items Concentration of radioactive material Bq/kg (dried mud) Full depth Sampling date Weather Mud sampling depth Mud content Radioactive iodine Radioactive cesium Remarks No. Water body Point Municipality m Property cm ％ I-131 Cs-134 Cs-137
1 Kinzanbashi Bridge 2012/6/19 Cloudy 0.2 2 91 Sand <30 40 60 Shishiorigawa River 2 Namiitabashi Bridge 2012/6/19 Cloudy 0.2 3 75 Silt <30 69 120 3 Tateyamaohashi Bridge 2012/6/19 Rain 0.5 2 92 Sand <30 21 35 Kesennumashi City 4 Okawa River Kamiyamabashi Bridge 2012/6/19 Rain 0.3 2 87 Sand <30 23 36 5 Okawa River Estuary 2012/6/19 Rain 0.3 3 94 Sand <30 <10 <10 6 Omosegawa River Ozakibashi Bridge 2012/6/19 Rain 0.9 2 83 Silt <30 67 92
7 K Arimagawa River Unandabashi Bridge 2012/6/19 Rain 0.3 2 90 Sand <30 56 90 8 i Kinryugawa River Obatabashi Bridge 2012/6/20 Cloudy 0.5 2 83 Sand <30 470 720 t 9 Kitakamigawa River Tomeohashi Bridge (Tome) 2012/6/19 Rain 2.1 5 90 Sand <30 29 45 a 10 k Sanhasamagawa River Domanbashi Bridge (Kurikoma Dam) Kuriharashi City 2012/6/20 Sunny 1.0 5 86 Gravel/sand <30 19 36 11 a Nihasamagawa River Kajiyabashi Bridge 2012/6/20 Cloudy 0.9 5 81 Gravel/sand <30 190 290 S m Hasamagawa 12 Hanayama Dam, inflow area 2012/6/19 Rain 0.8 5 82 Sand <30 50 85 y i River 13 s g Hasamagawa River Wakayanagi 2012/6/19 Rain 0.9 5 93 Sand <30 33 51 14 t a Yamayoshidabashi Bridge Tomeshi City 2012/6/21 Sunny 2.0 5 71 Silt <30 140 230 e w 15 Todorokibashi Bridge (Todoroki) 2012/6/20 Cloudy 0.6 2 59 Silt <30 200 270 m a Eaigawa River 16 Shimizukomon Weir Osakishi City 2012/6/20 Cloudy 0.2 3 81 Sand <30 25 38 Eaigawa R 17 River In Furukawa District, Osakishi City Shinborisaihon, entrance 2012/6/21 Cloudy 4.5 3 77 Sand <30 380 600 i 18 v Dekigawa River Kogotabashi Bridge Misatomachi Town 2012/6/20 Sunny 0.2 2 72 Silt <30 190 280 19 e Eaigawa River Oikawabashi Bridge (Tandai) Wakuyacho Town/Ishinomakishi City 2012/6/21 Sunny 0.6 2 86 Sand <30 32 47 r 20 Kyukitakamigawa River Kadonowaki Ishinomakishi City 2012/6/21 Sunny 0.2 2 90 Sand <30 14 22 21 Narusegawa River Onobashi Bridge (Ono) Higashimatsushimashi City 2012/6/21 Cloudy 0.3 3 89 Sand <30 11 17 22 Tagajozeki Weir 2012/6/21 Sunny 0.2 2 54 Sand <30 490 740 Sunaoshigawa River Tagajoshi City 23 Nenbutsubashi Bridge 2012/6/21 Cloudy 0.7 2 65 Sand/gravel <30 130 210 24 Teizan-unga Canal (Kyusunaoshigawa River) Teizanbashi Bridge Shiogamashi City/Shichigahamamachi Town/Tagajoshi City 2012/6/21 Cloudy 0.6 2 83 Sand <30 57 84 25 Nanakitabashi Bridge 2012/6/7 Sunny 0.3 1 80 Silt <30 180 270 Nanakitagawa River 26 Nanakitagawa Fukudaohashi Bridge 2012/6/7 Sunny 0.2 25 90 Sand <30 <10 14 River System Sendaishi City 27 Umedagawa River Fukudabashi Bridge 2012/6/7 Cloudy 0.8 10 70 Silt <30 230 370 28 Nanakitagawa River Takasagobashi Bridge 2012/6/7 Cloudy 0.3 20 60 Silt <30 250 380 29 Natorigawa River Yuriageohashi Bridge Sendaishi City/Natorishi City 2012/6/6 Sunny 0.2 25 57 Sludge <30 190 280 30 Natorigawa Yakushibashi Bridge 2012/6/6 Cloudy 0.6 2 83 Sand <30 29 39 River 31 System Masudagawa River Koyamabashi Bridge Natorishi City 2012/6/6 Cloudy, partly rain 0.4 5 90 Gravel/sand <30 47 77 32 Bishamonbashi Bridge 2012/6/6 Cloudy 0.3 10 60 Silt <30 630 960 2012/4/29 Sunny 0.3 3 84 Sand <30 460 660 33 Hadeniwabashi Bridge Marumorimachi Town 2012/5/7 Sunny 0.8 3 82 Sand <30 270 420 2012/6/4 Cloudy, partly sunny 1.0 20 87 Sand <30 230 350 2012/4/28 Sunny 0.7 3 87 Sand <30 230 340 A Abukumagawa River 34 Marumoribashi Bridge Marumorimachi Town 2012/5/7 Sunny 0.6 3 93 Sand with pebble <30 43 58 b u 2012/6/5 Sunny 0.3 4 89 Sand <30 220 340 k 2012/5/4 Rain 1.0 2 73 Sandy <30 1,400 2,000 35 u Ejiribashi Bridge Kakudashi City m 2012/5/28 Sunny 0.3 2 91 Sand <30 130 200 S 36 a Shiroishigawa River Before the confluence with Kawaragosawa River (Sunaoshibashi Bridge) Shiroishishi City 2012/6/5 Sunny 1.0 3 93 Sand/gravel <30 43 73 y g 37 s Saikawa River Etsubobashi Bridge Shiroishishi City 2012/6/5 Sunny 1.8 15 89 Sand/gravel <30 240 350 a t Shiroishigawa 38 w Matsukawa River Miyaohashi Bridge Zaomachi Town 2012/6/5 Cloudy 0.6 10 92 Sand <30 <10 19 e River 39 a Arakawa River Niragamibashi Bridge Muratamachi Town/Ogawaramachi Town 2012/6/5 Sunny 0.3 3 92 Sand <30 27 41 m
40 Shiroishigawa River Shirahatabashi Bridge Shibatamachi Town 2012/6/5 Cloudy 0.7 5 90 Sand <30 23 37 R i 2012/5/4 Cloudy 0.3 2 58 Loamy <30 970 1,500 41 Tsukinokiohashi Bridge Kakudashi City/Shibatamachi Town v 2012/5/28 Sunny 0.2 5 77 Sand <30 210 330 e 2012/4/28 Sunny 1.2 3 81 Sand <30 170 240 r 42 Abukumagawa River Abukumaohashi Bridge (Iwanuma) Iwanumashi City/Wataricho Town 2012/5/7 Sunny 0.8 3 82 Sand <30 160 220 2012/6/6 Cloudy 1.0 15 73 Sand <30 560 850
Abukumagawa River Estuary 2012/5/4 Cloudy 0.3 2 83 Sand <30 39 64 43 Iwanumashi City/Wataricho Town (Watariohashi Bridge) 2012/5/28 Rain 0.7 3 86 Sand <30 89 160
・Sampling points for rivers are listed from north to south, and for different points along the river, from upstream to downstream. ○River: Surrounding Environment Monitoring Results Left bank Right bank Sampling point Concentration of radioactive material Bq/kg (dry) Concentration of radioactive material Bq/kg (dry) Sampling date Weather Air dose Air dose Property Radioactive iodine Radioactive cesium Property Radioactive iodine Radioactive cesium Remarks No. Water body Point Municipality μSv/h μSv/h I-131 Cs-134 Cs-137 I-131 Cs-134 Cs-137
1 Kinzanbashi Bridge 2012/6/19 Cloudy Loamy <30 210 330 0.11 Loamy <30 180 290 0.11 Shishiorigawa River 2 Namiitabashi Bridge 2012/6/19 Cloudy Loamy <30 210 340 0.09 Loamy <30 110 180 0.09 3 Tateyamaohashi Bridge 2012/6/19 Rain Loamy <30 380 580 0.12 Loamy <30 210 320 0.13 Kesennumashi City 4 Okawa River Kamiyamabashi Bridge 2012/6/19 Rain Loamy <30 310 510 0.09 Loamy <30 130 200 0.09 5 Okawa River Estuary 2012/6/19 Rain Loamy <30 29 50 0.08 Clayish <30 62 91 0.07 6 Omosegawa River Ozakibashi Bridge 2012/6/19 Rain Loamy <30 15 29 0.06 Clayish <30 17 32 0.06 7 K Arimagawa River Unandabashi Bridge 2012/6/19 Rain Loamy <30 1,300 2,000 0.25 Loamy <30 510 810 0.21 8 i Kinryugawa River Obatabashi Bridge 2012/6/20 Cloudy Clayish <30 740 1,100 0.23 Clayish <30 400 620 0.20 t Kitakamigawa River 9 a Tomeohashi Bridge (Tome) 2012/6/19 Rain Loamy/clayish <30 280 460 0.08 Loamy <30 110 190 0.07 10 k Sanhasamagawa River Domanbashi Bridge (Kurikoma Dam) Kuriharashi City 2012/6/20 Sunny Silt <30 57 85 0.06 Sandy <30 17 27 0.07 11 a Nihasamagawa River Kajiyabashi Bridge 2012/6/20 Cloudy Loamy <30 310 470 0.16 Loamy <30 580 890 0.15 S m Hasamagawa 12 Hanayama Dam, inflow area 2012/6/19 Rain Loamy <30 290 450 0.18 Sandy <30 120 170 0.12 y i River 13 s g Hasamagawa River Wakayanagi 2012/6/19 Rain Loamy <30 240 350 0.10 Sandy <30 55 96 0.12 14 t a Yamayoshidabashi Bridge Tomeshi City 2012/6/21 Sunny Loamy <30 19 29 0.06 Loamy <30 17 28 0.07 e w 15 Todorokibashi Bridge (Todoroki) 2012/6/20 Cloudy Loamy <30 120 200 0.09 Loamy <30 44 65 0.11 m a Eaigawa River 16 Shimizukomon Weir Osakishi City 2012/6/20 Cloudy Sandy <30 39 63 0.07 Loamy <30 280 420 0.11 Eaigawa River 17 R In Furukawa District, Osakishi City Shinborisaihon, entrance 2012/6/21 Cloudy Loamy <30 300 500 0.10 Clayish <30 150 240 0.08 i 18 Dekigawa River Kogotabashi Bridge Misatomachi Town 2012/6/20 Sunny Loamy <30 590 910 0.09 Sandy <30 150 220 0.08 v 19 e Eaigawa River Oikawabashi Bridge (Tandai) Wakuyacho Town/Ishinomakishi City 2012/6/21 Sunny Loamy <30 130 180 0.07 Loamy <30 40 59 0.07 20 r Kyukitakamigawa River Kadonowaki Ishinomakishi City 2012/6/21 Sunny Loamy <30 100 170 0.08 Loamy <30 80 120 0.08 21 Narusegawa River Onobashi Bridge (Ono) Higashimatsushimashi City 2012/6/21 Cloudy Loamy <30 180 290 0.08 Loamy <30 210 330 0.09 22 Tagajozeki Weir 2012/6/21 Sunny Loamy <30 190 300 0.07 Loamy <30 200 310 0.07 Sunaoshigawa River Tagajoshi City 23 Nenbutsubashi Bridge 2012/6/21 Cloudy Loamy <30 190 300 0.08 Loamy <30 150 230 0.07 24 Teizan-unga Canal (Kyusunaoshigawa River) Teizanbashi Bridge Shiogamashi City/Shichigahamamachi Town/Tagajoshi City 2012/6/21 Cloudy Sandy <30 150 220 0.08 Loamy <30 54 87 0.07 25 Nanakitabashi Bridge 2012/6/7 Sunny Loamy <30 230 330 0.08 Loamy <30 130 200 0.07 Nanakitagawa River 26 Nanakitaga Fukudaohashi Bridge 2012/6/7 Sunny Loamy <30 330 490 0.07 Loamy <30 220 370 0.08 wa River Sendaishi City 27 System Umedagawa River Fukudabashi Bridge 2012/6/7 Cloudy Loamy <30 180 270 0.08 Loamy/sandy <30 230 350 0.11 28 Nanakitagawa River Takasagobashi Bridge 2012/6/7 Cloudy Loamy <30 200 320 0.07 Loamy/sandy <30 180 280 0.10 29 Natorigawa River Yuriageohashi Bridge Sendaishi City/Natorishi City 2012/6/6 Sunny Loamy/sandy <30 24 33 0.05 Loamy/sandy <30 130 190 0.10 30 Natorigawa Yakushibashi Bridge 2012/6/6 Cloudy Loamy <30 470 710 0.13 Loamy <30 170 270 0.09 River 31 System Masudagawa River Koyamabashi Bridge Natorishi City 2012/6/6 Cloudy, partly rain Loamy/clayish <30 760 1,200 0.14 Loamy/clayish <30 2,300 3,400 0.19 32 Bishamonbashi Bridge 2012/6/6 Cloudy Loamy/sandy <30 120 190 0.11 Loamy/sandy <30 380 590 0.10 2012/4/29 Sunny Sandy <30 410 550 0.30 Loamy <30 370 570 0.42 33 Hadeniwabashi Bridge Marumorimachi Town 2012/5/7 Sunny Sandy <30 410 560 0.36 Loamy <30 500 740 0.36 2012/6/4 Cloudy, partly sunny Loamy <30 2,100 3,300 0.37 Loamy <30 580 890 0.35 2012/4/28 Sunny Sandy <30 170 260 0.22 Sandy/skeletal <30 130 180 0.12 A Abukumagawa River 34 b Marumoribashi Bridge Marumorimachi Town 2012/5/7 Sunny Sandy <30 240 340 0.21 Sandy/skeletal <30 85 120 0.13 u 2012/6/5 Sunny Sandy <30 200 320 0.21 Sandy <30 51 97 0.12 k 2012/5/4 Rain Loamy <30 810 1,200 0.38 Loamy <30 1,100 1,600 0.32 35 u Ejiribashi Bridge Kakudashi City m 2012/5/28 Sunny Loamy <30 380 560 0.33 Loamy <30 1,100 1,600 0.35 S 36 a Shiroishigawa River Before the confluence with Kawaragosawa River (Sunaoshibashi Bridge) Shiroishishi City 2012/6/5 Sunny Loamy/sandy <30 540 860 0.22 Loamy <30 790 1,200 0.28 y g 37 s Saikawa River Etsubobashi Bridge Shiroishishi City 2012/6/5 Sunny Loamy <30 390 570 0.17 Loamy <30 400 610 0.18 a t Shiroishigawa 38 w Matsukawa River Miyaohashi Bridge Zaomachi Town 2012/6/5 Cloudy Loamy <30 410 630 0.17 Loamy <30 370 580 0.15 e River 39 a Arakawa River Niragamibashi Bridge Muratamachi Town/Ogawaramachi Town 2012/6/5 Sunny Loamy <30 740 1,200 0.17 Loamy <30 880 1,300 0.18 m
40 Shiroishigawa River Shirahatabashi Bridge Shibatamachi Town 2012/6/5 Cloudy Loamy <30 230 340 0.13 Loamy <30 380 570 0.17 R 2012/5/4 Cloudy Loamy <30 110 190 0.17 Loamy <30 84 120 0.19 41 i Tsukinokiohashi Bridge Kakudashi City/Shibatamachi Town v 2012/5/28 Sunny Loamy <30 810 1,200 0.16 Loamy <30 290 450 0.18 e 2012/4/28 Sunny Silt <30 1,200 1,800 0.33 Sandy/skeletal <30 120 190 0.21 r 42 Abukumagawa River Abukumaohashi Bridge (Iwanuma) Iwanumashi City/Wataricho Town 2012/5/7 Sunny Clay <30 1,400 2,000 0.31 Earth <30 160 240 0.20 2012/6/6 Cloudy Loamy <30 680 1,000 0.34 Loamy <30 250 360 0.22
Abukumagawa River Estuary 2012/5/4 Cloudy Sandy <30 640 950 0.18 Loamy <30 380 570 0.15 43 Iwanumashi City/Wataricho Town (Watariohashi Bridge) 2012/5/28 Rain Loamy <30 1,500 2,200 0.22 Loamy <30 230 350 0.17 ・Air dose was measured with a survey meter, TCS-171 or TCS-172 of Hitachi-Aloka Medical, Ltd. ・Sampling points for rivers are listed from north to south, and for different points along the river, from upstream to downstream. ○Lake and Headwater: Water Quality Monitoring Results Sampling point General items Concentration of radioactive material Bq/L Full depth Sampling date Weather Sampling depth Secchi disk depth Electrical conductivity SS Turbidity Radioactive iodine Radioactive cesium Remarks No. Point m m m mS/m mg/L I-131 Cs-134 Cs-137
Surface layer 2012/6/20 0.5 11 <1 1 <1 <1 <1 1 Kurikoma Dam Dam site Cloudy 16.1 2.0 Lower layer 2012/6/20 15.1 8 200 140 <1 <1 <1
Surface layer 2012/6/19 0.5 8 <1 1 <1 <1 <1 2 Hanayama Dam Dam site Rain 25.8 1.5 Lower layer 2012/6/19 24.8 4 190 830 <1 <1 <1
3 Kitakamigawa River System Izunuma Lake Lake exit Surface layer 2012/6/26 Sunny 0.7 0.0 0.5 15 17 8 <1 <1 <1
4 Naganuma Lake Lake exit Surface layer 2012/6/26 Sunny 1.1 0.0 >1.1 17 <1 1 <1 <1 <1
5 Shukunosawatameike Pond Pond exit Surface layer 2012/6/27 Sunny 1.0 0.0 >1.0 10 4 2 <1 <1 <1
Surface layer 2012/6/27 0.5 13 1 1 <1 <1 <1 6 Narugo Dam Dam site Sunny 54.2 2.0 Lower layer 2012/6/27 53.2 20 130 91 <1 <1 <1
Surface layer 2012/6/28 0.5 6 7 4 <1 <1 <1 7 Minamikawa Dam Dam site Sunny 26.2 1.6 Narusegawa River Lower layer 2012/6/28 25.2 9 20 11 <1 <1 <1 System 8 Miyatoko Dam Dam site Surface layer 2012/6/28 Sunny 0.5 0.0 >0.5 7 2 2 <1 <1 <1
Sunaoshigawa River Surface layer 2012/6/28 0.5 13 5 3 <1 <1 <1 9 Sonoseki Dam Sunny 10.7 1.4 System Lower layer 2012/6/28 9.7 17 11 9 <1 <1 <1
10 Nanakitagawa River System Nanakita Dam Dam site Surface layer 2012/6/27 Sunny 0.9 0.0 0.8 6 5 4 <1 <1 <1
11 Marutazawatameike Pond Pond exit Surface layer 2012/6/28 Sunny 0.4 0.0 >0.4 30 6 3 <1 <1 <1
12 Amanuma Lake Lake exit Surface layer 2012/6/28 Sunny 1.0 0.0 0.5 27 9 3 <1 <1 <1
Surface layer 2012/6/27 0.5 6 1 1 <1 <1 <1 13 Okura Dam Dam site Sunny 33.1 1.7 Natorigawa River Lower layer 2012/6/27 32.1 4 13 7 <1 <1 <1 System 14 Tarumizu Dam Dam site Surface layer 2012/6/29 Clundy, then sunny 1.2 0.0 >1.2 7 2 2 <1 <1 <1
Abukumagawa River Surface layer 2012/6/29 0.5 7 3 1 <1 <1 <1 15 Shichikashuku Dam Dam site Cloudy 15.0 0.8 System Lower layer 2012/6/29 14.0 6 37 13 <1 <1 <1
16 Bagyunuma Lake Lake exit Surface layer 2012/6/29 Cloudy 0.7 0.0 0.5 18 10 5 <1 <1 <1
○Lake and Headwater: Sediment and Surrounding Environment (Lake Shore) Monitoring Results Sediment Surrounding environment (lake shore)
Sampling point Soil General items Concentration of radioactive material Bq/kg (dried mud) Full depth Sampling date Weather Concentration of radioactive material Bq/kg (dry) Remarks m Air dose Mud sampling depth Mud content Radioactive iodine Radioactive cesium Property Radioactive iodine Radioactive cesium No. Point Property cm ％ I-131 Cs-134 Cs-137 I-131 Cs-134 Cs-137 μSv/h 1 Kurikoma Dam Dam site 2012/6/20 Cloudy 16.1 10 56 Silt <30 300 500 Loamy <30 480 760 0.17 2 Hanayama Dam Dam site 2012/6/19 Rain 25.8 10 48 Silt <30 890 1,400 Loamy <30 1,700 2,700 0.16 Lake exit 3 Kitakamigawa River Izunuma Lake 2012/6/26 Sunny 0.7 10 87 Sand/silt <30 17 31 Loamy <30 160 250 0.06 System 4 Naganuma Lake Lake exit 2012/6/26 Sunny 1.1 5 57 Silt <30 150 270 Loamy <30 100 150 0.06 5 Shukunosawatameike Pond Pond exit 2012/6/27 Sunny 1.0 5 80 Sand <30 490 770 Loamy <30 92 150 0.06 6 Narugo Dam Dam site 2012/6/27 Sunny 54.2 10 50 Silt <30 110 180 Loamy/clayish <30 110 180 0.09 Dam site 7 Narusegawa River Minamikawa Dam 2012/6/28 Sunny 26.2 3 43 Silt <30 650 950 Loamy <30 90 130 0.07 System 8 Miyatoko Dam Dam site 2012/6/28 Sunny 0.5 2 70 Silt・Gravel <30 <10 12 Clayish <30 70 110 0.08 9 Sunaoshigawa River System Sonoseki Dam 2012/6/28 Sunny 10.7 5 36 Sludge <30 440 750 Sandy <30 110 180 0.09 10 Nanakitagawa River System Nanakita Dam Dam site 2012/6/27 Sunny 0.9 5 64 Sludge <30 82 150 Clayish <30 79 110 0.05 11 Marutazawatameike Pond Pond exit 2012/6/28 Sunny 0.4 5 80 Silt <30 380 560 Loamy <30 110 200 0.08 12 Amanuma Lake Lake exit 2012/6/28 Sunny 1.0 5 95 Gravel/sand <30 420 660 Loamy <30 53 94 0.07 13 Okura Dam Dam site 2012/6/27 Sunny 33.1 ------Loamy <30 110 150 0.03 Unable to collect sediment due to submerged trees 14 Natorigawa River System Tarumizu Dam Dam site 2012/6/29 Clundy, then sunny 1.2 1 75 Sand <30 110 160 Loamy <30 320 500 0.09 15 Abukumagawa River System Shichikashuku Dam Dam site 2012/6/29 Cloudy 15.0 10 51 Silt <30 1,200 1,800 Loamy <30 410 610 0.27 16 Bagyunuma Lake Lake exit 2012/6/29 Cloudy 0.7 5 78 Gravel/sand <30 510 800 Loamy <30 200 300 0.25 ・Air dose was measured with a survey meter, TCS-171 or TCS-172 of Hitachi-Aloka Medical, Ltd.
・Sampling points are listed from north to south. Miyagi Prefecture
Legend Rivers Lakes